<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model = "isAll"/>
    <button @click = "isAll = !isAll">反选</button>
    <ul>
      <li v-for="item in arr" :key ="item.name" >
        <input type="checkbox" v-model="item.c"/>
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
  computed:{
    isAll:{
        get(){
            return this.arr.every((item) =>item.c===true)
        },
        set(value){
            return this.arr.forEach((item)=>{item.c=value})
        }
        
    }
  }
};
</script>

<style>
</style>